Entity: otbn_mac_bignum
- File: otbn_mac_bignum.sv
Diagram
Description
Copyright lowRISC contributors. Licensed under the Apache License, Version 2.0, see LICENSE for details. SPDX-License-Identifier: Apache-2.0
Ports
| Port name | Direction | Type | Description |
|---|---|---|---|
| clk_i | input | ||
| rst_ni | input | ||
| operation_i | input | mac_bignum_operation_t | |
| mac_en_i | input | ||
| operation_result_o | output | [WLEN-1:0] | |
| operation_flags_o | output | flags_t | |
| operation_flags_en_o | output | flags_t | |
| ispr_acc_o | output | [WLEN-1:0] | |
| ispr_acc_wr_data_i | input | [WLEN-1:0] | |
| ispr_acc_wr_en_i | input |
Signals
| Name | Type | Description |
|---|---|---|
| adder_op_a | logic [WLEN-1:0] | |
| adder_op_b | logic [WLEN-1:0] | |
| adder_result | logic [WLEN-1:0] | |
| adder_result_hw_is_zero | logic [1:0] | |
| mul_op_a | logic [QWLEN-1:0] | |
| mul_op_b | logic [QWLEN-1:0] | |
| mul_res | logic [WLEN/2-1:0] | |
| mul_res_shifted | logic [WLEN-1:0] | |
| acc | logic [WLEN-1:0] | |
| acc_d | logic [WLEN-1:0] | |
| acc_q | logic [WLEN-1:0] | |
| acc_en | logic |
Constants
| Name | Type | Value | Description |
|---|---|---|---|
| QWLEN | int unsigned | WLEN / 4 | The MAC operates on quarter-words, QWLEN gives the number of bits in a quarter-word. |
Processes
- unnamed: ( )
Type: always_comb
Description
Extract QWLEN multiply operands from WLEN operand inputs based on chosen quarter word from the instruction (operand_[a|b]_qw_sel).
- unnamed: ( )
Type: always_comb
Description
Shift the QWLEN multiply result into a WLEN word before accumulating using the shift amount supplied in the instruction (pre_acc_shift_imm).
- unnamed: ( @(posedge clk_i or negedge rst_ni) )
Type: always_ff